Draft at least two O-Linemen earlyish

I rarely disagree with your take on things, but there's little difference between the Saints and the Lions approach:-

Taylor Decker LT, 1st
Graham Glasgow LG, 3rd (drafted same year as they took Decker in the first)
Frank Ragnow C, 1st
Kevin Zeitler RG, FA (former 1st round pick)
Penei Sewell RT, 1st

The difference is that the Lions are doing it better. All those skill position players they have are enabled by that line. They made Jamaal Williams into a TD machine, here he just runs into brick walls.
Has Det drafted well? Yes. But what everyone constantly overlooks is that they had 19, yes 19 top 100 picks over the last 5 yrs , including a #2,#3,#7 picks in the draft. AND they got Goff in the Stafford trade. Do you know how much easier it makes it to hit on picks when you have that kind of fire power??